March 28, 2009 1:20 AM AKDT

Plume heights of 15.2 km were recorded for this explosive event. The duration of the lightning
sequence was 42.8 minutes. This explosion did not have any precursor lightning like the three
previous events. The electrical activity began with small discharges over the vent, growing
to larger, discrete discharges as the activity waned.
At approximately 10:00 UTC a subsequent small explosive event occurred. The final lightning
discharge occurred at approximately 10:03.